Oregon State Police have launched a criminal investigation. No results or details have been released.

A college spokesman said officials received a threat around 10 a.m., targeting the college's Redwood campus, an 80-acre, wooded complex on the outskirts of Grants Pass. The college then activated its emergency-alert system, informing students and employees of the threat. The alert was followed by a message on Twitter, asking everyone to evacuate.

Shortly afterward, Rogue officials sent out an evacuation notice for the Riverside campus, which spans four blocks in downtown Medford, and for the Table Rock campus in White City.

Students and staff members were advised to take their purses backpacks, computers and cell phones and have been urged not to wait at transit stops adjacent to the campuses.